Exploring the roles of CREBRF and TRIM2 in the regulation of angiogenesis by high-density lipoproteins

Nathan K.P. Wong, Helena Cheung, Emma L. Solly, Laura Z. Vanags, William Ritchie, Stephen J. Nicholls, Martin K.C. Ng, Christina A. Bursill, Joanne T.M. Tan

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Angiogenesis, the process of forming new blood vessels, is crucial in the physiological response to ischemia, though it can be detrimental as part of inflammation and tumorigenesis. We have previously shown that high-density lipoproteins (HDL) modulate angiogenesis in a context-specific manner via distinct classical signalling pathways, enhancing hypoxia-induced angiogenesis while suppressing inflammatory-driven angiogenesis. Whether additional novel targets exist to account for these effects are unknown. A microarray approach identified two novel genes, cyclic-adenosine-monophosphate-response-element-binding protein 3 regulatory factor (CREBRF) and tripartite motif-containing protein 2 (TRIM2) that were upregulated by reconstituted HDL (rHDL). We measured CREBRF and TRIM2 expression in human coronary artery endothelial cells following incubation with rHDL and exposure to either hypoxia or an inflammatory stimulus. We found that CREBRF and TRIM2 mRNA were significantly upregulated by rHDL, particularly in response to its phospholipid component 1-palmitoyl-2-linoleoyl-phosphatidylcholine, however, protein expression was not significantly altered. Knockdown of TRIM2 impaired endothelial cell tubulogenesis in vitro in both hypoxia and inflammation, implying a necessary role in angiogenesis. Furthermore, TRIM2 knockdown attenuated rHDL-induced tubule formation in hypoxia, suggesting that it is important in mediating the pro-angiogenic action of rHDL. Our study has implications for understanding the regulation of angiogenesis in both of these pathophysiological contexts by HDL.

Original languageEnglish
Article number1903
JournalInternational Journal of Molecular Sciences
Volume19
Issue number7
DOIs
Publication statusPublished - Jul 2018

Keywords

  • Angiogenesis
  • CREBRF
  • High-density lipoproteins
  • Hypoxia
  • Inflammation
  • TRIM2

ASJC Scopus subject areas

  • Catalysis
  • Molecular Biology
  • Spectroscopy
  • Computer Science Applications
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry

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